SQLite

SQLite.  What do you think of it?

[ ] Yes, SQLite is sufficient for anus haxxing.
[ ] No, SQLite is insufficient for anus haxxing.

>>5
This is really the crucial question. MySQL and Postgres have way too much overhead for a neat little script that only runs on your desktop machine, and SQLite is certainly not beefily robust enough to hold up the weight of the internet all by its lonesome self (ie. you shouldn't run a Rails app on it).

If you've already decided on SQL, then it's just a question of where you're deploying your system, really.